The Trafalgar Square pigeons are not the only birds in London. Join Britain's favourite birdwatcher on a trip around the capital, in search of some of its best-kept birding secrets. Amongst the usual ducks, geese and pigeons, Bill Oddie discovers the mysterious and elusive bittern, the rare and beautiful smew, and a bizarre feathered immigrant from India, the ring-necked parakeet - now an official British bird. Show less